Water-filter.



H. BRUNNER.

WATER FILTER.

APPLIoATloN FILED mmo- Patented Nov. 24, 1998.

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HANS BR'UNNER, OF SAN FRANCISCO, CALIFORNIA.

WATER-FILTER Specification of Letters Patent.

Patented Nov. 24, 1908.

Application filed January 20, 1908. Serial No. 411,790.

To all whom it may concern:

Be it known that I, Hans BunNNnu, a citizen of Switzerland, resident ofthe city and county of San Francisco and State of California, haveinvented new and useful Improvements in Tater-Filters, of which thefollowing is a specification.

This invention has for its object the production of an improvedwater-filter of that class or description in which provision is made fordrawing off the water before it has passed through the filtering medium,without interrupting the filtering operation, for the purpose offurnishing water either in a filtered or an unfiltered state, asrequired for use.

A further object of the invention is to utilize the incoming water for acleansing medium, to remove the coating or deposit of sediment on thesurface of the filtering material, and especially to apply the water insuch manner as to constantly cleanse the filtering-surface withoutinterfering with or interrupting the filtering operation.

To these ends and objects chiefly my said invention consists in certainnovel parts and combination of parts as hereinafter set forth in thefollowing description and pointed out in the claims at the end.

The drawings accompanying and forming part of this specificationillustratetwo forms or constructions of my improved filter; one of whichis designed for domestic purposes where the consumption of filteredwater is small; and the other, for supplying filtered water in largerquantities where the consumption is greater.

Figure l of the drawings, represents in vertical section, a filterembodying my invention of relatively small capacity7 designed moreespecially for household use. Fig. Q is a plan view of the supportingbase of the filter. Fig. 3 is a vertical sectional view of a filter ofiny invention in which the water distributing tube is rotated by thepressure of the inflowing water, for the purpose of causing the jets towash the surface of the filtering medium.

In the drawing a indicates the filtering cylinder; o the surroundingcasing inclosing the cylinder, and c the perforated water-distributingtube. The inlet (I is for the unfiltered water where connection is madewith a service-pipe b v a coupling (15,' and the separate outlets fl-gat the bottom are for l the filtered water and for the unfiltered walter respectively.

2 indicates the base of the. filter which is preferably circular inoutline. lt is provided with an annular seat 3 to support the filtercylinder o and is provided with a flange S internally screw threaded toreceive and support the casing 7). A tie-rod 4 is concentrically locatedwith reference to the filtering cylinder and the outer casing, beingpreferably supported iu the base Q by being screw threaded thereto asindicated in Fig. l. A cap 5, provided with a flange (t, sits over theupper end ofthe filter l and holds the latter in place upon its seat 3,the cap in turn being held in position by a nut 7 upon the rod f. Thereis between the filter u and the casing Y) a storage space for thefiltered water.

A novel feature of the water-filter of my invention consists in sprayingor applying the unfiltered water in a number of jets or relatively smallstreams against the surface y of the filtering body in such manner as toconstantly wash thc filtering surface for its entire length and breadthwhile the filtering operation is going on.

into the hollow central space o* of the cylinder the water is conductedthrough the perforated tube f' which is so mounted or supported in thehollow center of the filtering-mass f1, as to stand out of contact withthe surrouiuling walls but so close thereto'that the jets of waterissuing from the holes cX in the tube c will impinge directly upon thewalls of the filter and with sufficient force to cleanse the. latter,the .force of the jets notbeing dissipated by their having to passthrough a body of water of considerable to act on. At one end of thetube c communica tes with the inlet to which the supplypipe'fortheunfiltered water is couplcdv-f-aiul at the opposite, end (f2 the tube isclosed. The space, inclosed by the hollow filtering-mass conununicateswith a chamber or compartment Iz. in the. bottom of the filter, where ascrew -threaded socket v' is provided for coupling a pipe, or a faucetfor drawing off the unfiltered wafer. The opening Yfrom the spacebetween the tube c and the inner wall of the filter into the chamber z.is substantially cti-extensive with the cross area of such space. sothat the .sediment washed down from the filtering surface readily passesinto thickness before reaching the walls they are the chamber It, whichserves as a sort of collecting pocket, and t-here is no place forlodgment of the sediment between the said water space and collectingchamber or compartment.

Apertures CX in the tube are arranged at intervals apart around thecircumference and from end to end of the tube, preferably in a slantingdirection downward, by virtue of which the jets will impinge upon thesurrounding walls at an angle, and so wash and continuallyT cleanse thefiltering-surface from the top to the bottom. The perforations aresuitably arranged for that purpose at intervals apart circumferentiallyand also longitudinally of the tube from top to bottom.

In the form or construction of this filter which I have shown in Fig. l,the waterdistributing tube is immovably fixed within the hollou7 spaceof the filtering-mass, and the apertures cX for the jets are arranged soas to reach and wash down the entire filtering-surface. lVhereas in theconstruction illustrated in Fig. 8, the tube c is mounted for rotationin the inclosed filtering-space, and is fixed to or connected with asmall turbine wheel m. Fixed to the base of the filter and locateddirectly above the collecting chamber or compartment /L is a spider-likesupport j for the tie-rod l, the upper end of which passes through thecap 5 that engages with and holds in place the upper end of the filtera. Loosely supported upon the rod 4 and resting upon the spider-likesupport j is a disk or head to which the lower end of the tube c issecured preferably by having a screw threaded connection therewith. Theupper end of this tube is connected with the turbine-wheel m which isalso loosely supported upon the rod i and is located within a chamberformed therefor in the cap 5. The buckets of the turbine or water wheel.m are located opposite the inlet delivery port of the supply pipe (Z,this pipe, in this form of the invention, delivering` to the filter atits upper end. By this means the tube is caused to revolve and is keptin motion by the head or pressure of the in-coming water, with theeifect to project the ets through the body of water in the surroundingspace with suflicient force to strike and wash down the walls of thefiltering medium. A revolving tube driven in this manner is substitutedfor the stationary tube in a filter of the larger size or capacity,wherein the space inclosed by the filtering-mass and in which the tubeis inclosed, is of such capacity that the larger body of water situatedbetween the tube and the surrounding walls will be better penetrated bythe jets, and they will act more effectively to wash down the walls,than where the jets act on the walls through the head or pressure of theincoming water without the centrifugal motion. In a filter of smallcapacity, where the filtering space is of comparatively small area andthe surround-A lng walls are in close relation to the tube, the jetswill ordinarily be projected through the confined body of water by thehead or pressure alone with sufficient force to clean thefiltering-surface; and in that event, the stationary, or non-rotating,distributing tube can be used with the advantage of reducing the cost ofconstruction.

It will be understood that the cocks or faucets are to be provided onthe inlet-pipe for the unfiltered water and upon the pipes which arecoupled to the outlet-s for the filtered-water leading from the space inthe inclosing case, and for the outlet from the space in which theperforated distributing tube operates. Such arrangement of outlets andfaucets permits the water to be drawn directly through the apparatuswithout being filtered, as well as for frequently blowing off orcleansing the filtering' chamber.

lVhat I claim as my invention is:

l. A filtering device having a circular base provided with an annularseat for a filtering cylinder, a filtering cylinder seated therein, acap adapted to close the top of the cylinder and provided with a fiangeto fit on the cylinder and a tie-rod extending through the centralhollow space of the cylinder, and adapted to draw the cap against thecylinder; a distributing-tube supported from the cap in the centralhollow space clear of the surrounding walls, and a tubular coupling inthe center of the base connecting the lower end of the distributingtubewith an inlet in the side of the base, and a casing surrounding thefiltering cylinder adapted to inclose a storage-space for the filteredliquid, the said base having an outlet communicating with thestorage-space in the casing.

2. In a water filter, the combination of a filter-body having a hollowcentral space into which the unfiltered water is delivered, awater-tight case inclosing a storage space outside the filter for thefiltered water, a water distributing tube located in the space withinthe filter-body and standing clear of the walls thereof, and a basehaving' a sediment-collecting chamber located below the space betweenthe distributing tube and the inner surface of the filter, the opening.into the said chamber being substantially co-eX- tensive with the crossarea of the space between the said tube and filter, substantially as setforth.

In witness that I claim the foregoing, I sign my name in the presence oftwo witnesses.

E. E. OsBoRN, P. S. PIDwELL.

